body { 
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    margin:0 auto;
    font-size: 14px;
    font-family: Helvetica, sans-serif;
    color: #666;
    line-height: 1.5;
    /* height: 2000px; */
    background-color: rgb(240, 240, 240);
}
a {
    text-decoration: none;
    color: #333333;
}
ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
.hearder .app {
    margin: 0;
    padding: 0;
}
.app {
    height: 45px;
}
.app ul li {
    float: left;
    height: 45px;
    background-color: #333333;
    text-align: center;
    vertical-align: middle;
    line-height: 45px;
    color: #fff;
    font-size: 14px;
}
.app ul li:nth-child(1) {
    width: 8%;
}
.app ul li:nth-child(2) {
    width: 10%;
}
.app ul li:nth-child(2) img {
    width: 45px;
}
.app ul li:nth-child(3) {
    width: 57%;
}
.app ul li:nth-child(4) {
    width: 25%;
    background-color: #f63515;
}
.search-warp {
    overflow: hidden;
    position: fixed;
    height: 44px;
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    background-color: transparent;
}
.search-btn {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
    background-color: transparent;
}
.search-btn::after {
    content: '';
    display: block;
    width: 20px;
    height: 18px;
    background: url(../images/span.png)no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}
.search-login {
    position: absolute;
    top: 0;
    right: 5px;
    width: 40px;
    height: 44px;
    background-color: transparent;
    color: #fff;
    line-height: 44px;
    text-align: center;
}
.search {
    position: relative;
    height: 30px;
    background-color: #fff;
    margin: 0 50px;
    border-radius: 15px;
    margin-top: 7px;
}
.jd-icon {
    position: absolute;
    top: 8px;
    left: 13px;
    width: 20px;
    height: 15px;
    background: url(../images/jd.png)no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after {
    content: '';
    position: absolute;
    top: 0;
    right: -8px;
    display: block;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}
.sou {
    position: absolute;
    top: 8px;
    left: 50px;
    background-color: pink;
    width: 18px;
    height: 15px;
    background: url(../images/jd-sprites.png)no-repeat -81px 0;
    /* 将精灵图缩小一半（2倍精灵图） */
    background-size: 200px auto;
}
.slider {
    width: 100%;
}
.slider img {
    width: 100%;
}
/* 板心 */
.banner {
    width: 100%;
}
.banner a {
    float: left;
}
.banner a:nth-child(1),
.banner a:nth-child(3) {
    width: 25%;
}
.banner a:nth-child(2) {
    width: 50%;
    margin-top: 14px;
}
.banner img {
    width: 100%;
}
/* 购物 */
.shop {
    overflow: hidden;
    width: 100%;
}
.shop a {
    float: left;
    width: 20%;
    text-align: center;
    margin: 5px 0;
}
.shop img {
    width: 40px;
}
.shop span {
    display: block;
}
.opa {
    overflow: hidden;
    width: 90%;
    margin: auto;
    text-align: center;
    background-color: rgb(255, 255, 255);
}
.opa a {
    float: left;
    width: 25%;
    box-sizing: border-box;
}
.opa a:nth-child(1),
.opa a:nth-child(4) {
    padding-top: 28px;
}
.opa a span {
    font-size: 18px;
}
.opa a p {
    margin: 0;
    padding: 0;
}
.opa img {
    width:60px;
}
.opa a:nth-child(-n+3) {
    border-right: 1px solid #ccc;
}